linux-kernel - [RFC PATCH ghak100 V1 0/2] audit: avoid umount hangs on missing mount

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Message-Id: <cover.1542149969.git.rgb@redhat.com>
Date:   Fri, 16 Nov 2018 12:33:12 -0500
From:   Richard Guy Briggs <rgb@...hat.com>
To:     linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Audit Mailing List <linux-audit@...hat.com>
Cc:     Paul Moore <paul@...l-moore.com>, Eric Paris <eparis@...hat.com>,
        Steve Grubb <sgrubb@...hat.com>,
        Richard Guy Briggs <rgb@...hat.com>
Subject: [RFC PATCH ghak100 V1 0/2] audit: avoid umount hangs on missing mount

On user and remote filesystems, a forced umount can still hang due to
attemting to fetch the fcaps of a mounted filesystem that is no longer
available.

These two patches take different approaches to address this, one by
avoiding the lookup when the MNT_FORCE flag is included, the other by
providing a method to filter out auditing specified types of filesystems.

This can happen on ceph, cifs, 9p, lustre, fuse (gluster) or NFS.

Arguably the better way to address this issue is to disable auditing
processes that touch removable filesystems.
Please see the github issue tracker
https://github.com/linux-audit/audit-kernel/issues/100

Richard Guy Briggs (2):
  audit: avoid fcaps on MNT_FORCE
  audit: moar filter PATH records keyed on filesystem magic

 fs/namei.c            |  2 +-
 fs/namespace.c        |  3 +++
 include/linux/audit.h |  8 ++++++--
 kernel/audit.c        |  5 +++--
 kernel/audit.h        |  2 +-
 kernel/auditsc.c      | 29 ++++++++++++++++++++++++++---
 6 files changed, 40 insertions(+), 9 deletions(-)

-- 
1.8.3.1